//
//  UIBarButtonItem+Extension.swift
//  weibo
//
//  Created by Mac on 16/5/20.
//  Copyright © 2016年 fengzhixiang. All rights reserved.
//

import UIKit

/// 扩展UIBarButtonItem
extension UIBarButtonItem {
    /// 便利构造函数, 在扩展中只能添加便利构造函数
    convenience init(imageName: String,target:AnyObject?,action: Selector) {
        //创建按钮
        let button = UIButton()
        button.setImage(UIImage(named: imageName), forState: UIControlState.Normal)
        button.setImage(UIImage(named:  imageName + "_highlighted"), forState: UIControlState.Highlighted)
        button.sizeToFit()

        //设置点击事件
        button.addTarget(target, action: action, forControlEvents: UIControlEvents.TouchUpInside)

        //构建UIBarButtonItem.需要调用自己的指定构造函数
        self.init(customView:button)
    }

}
